Alkaline-mechanical pretreatment process for enhanced anaerobic digestion of thickened waste activated sludge with a novel crushing device: Performance evaluation and economic analysis

2014 ◽  
Vol 165 ◽  
pp. 183-190 ◽  
Author(s):  
Si-Kyung Cho ◽  
Hyun-Jun Ju ◽  
Jeong-Gyu Lee ◽  
Sang-Hyoun Kim
Keyword(s):  
Performance Evaluation ◽  
Anaerobic Digestion ◽  
Economic Analysis ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Device Performance ◽  
Mechanical Pretreatment

A mechanical pretreatment of waste activated sludge for improvement of anaerobic digestion system

1997 ◽  
Vol 36 (12) ◽  
pp. 111-116 ◽  
Author(s):  
Kyung-Yub Hwang ◽  
Eung-Bai Shin ◽  
Hong-Bok Choi
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Protein Concentration ◽  
Waste Activated Sludge ◽  
Cell Rupture ◽  
Mechanical Pretreatment ◽  
Solids Concentration ◽  
Sludge Pretreatment ◽  
Volatile Solids ◽  
Before And After

This study evaluated the effectiveness of sewage pretreatment as it affected the subsequent anaerobic digestion of waste activated sludge (WAS). The key to this sludge pretreatment process was that microorganism cells within WAS were ruptured by mechanical jet and smash under pressurized conditions, 5–50 bar pressure. Cell rupture was estimated by soluble protein concentration (SPC) because the cytoplasm of microorganisms is mainly composed of protein. The SPC in the WAS varied significantly before and after pretreatment. In particular, cell rupture increased from 6% to 43% with the increase of the pretreated pressure (5–30bar), volatile solids concentration and thickening time of WAS. In the WAS pretreatment with long-thickening time (12h < thickening time ≤ 48h), cell rupture was monitored 5–10 % higher than short-thickening time (Oh <thickening time ≤ 12h). Generally, it was observed that higher anaerobic digestion efficiencies of WAS could be obtained according to the increase of microorganism cell rupture through mechanical pretreatment of WAS.

Occurrence, effect, and fate of residual microplastics in anaerobic digestion of waste activated sludge: A state-of-the-art review

2021 ◽  
pp. 125035
Author(s):  
Zhang-Wei He ◽  
Wen-Jing Yang ◽  
Yong-Xiang Ren ◽  
Hong-Yu Jin ◽  
Cong-Cong Tang ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
State Of The Art ◽  
Waste Activated Sludge
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